But I would guess there's a higher percentage of people with a smart phone or a laptop with a wireless connection. I would agree with the previous poster saying a website may be a better way to go. Whether that's just a regular website being provided, or you go with a larger plan to try and provide wifi access to that full square mile, I'm not sure where you draw the line.
Keep us all updated with what you find out, as I don't think any of us know the costs of the TV equipment, but most people have an idea on the costs of hosting a website and it's not expensive at all. Going with providing wifi access to the while RV park could get costly, but who knows...maybe that is already in place?